The Infinity Transmitter courtesy of Exodus originally typed by: <<<Ghost Wind>>> FROM THE BOOK BUILD YOUR OWN LASER, PHASER, ION RAY GUN & OTHER WORKING SPACE-AGE PROJECTS BY ROBERT IANNINI (TAB BOOKS INC) Description: Briefly, the Infinity Transmitter is a device which activates a microphone via a phone call. It is plugged into the phone line, and when the phone rings, it will immediately intercept the ring and broadcast into the phone any sound that is in the room. This device was originally made by Information Unlimited, and had a touch tone decoder to prevent all who did not know the code from being able to use the phone in its normal way. This version, however, will activate the microphone for anyone who calls while it is in operation. NOTE: It is illegal to use this device to try to bug someone. It is also pretty stupid because they are fairly noticeable. Parts List: Pretend that uF means micro Farad, cap= capacitor Part # Description ---- - ----------- R1,4,8 3 390 k 1/4 watt resistor R2 1 5.6 M 1/4 watt resistor R3,5,6 3 6.8 k 1/4 watt resistor R7/S1 1 5 k pot/switch R9,16 2 100 k 1/4 watt resistor R10 1 2.2 k 1/4 watt resistor R13,18 2 1 k 1/4 watt resistor R14 1 470 ohm 1/4 watt resistor R15 1 10 k 1/4 watt resistor R17 1 1 M 1/4 watt resistor C1 1 .05 uF/25 V disc cap C2,3,5,6,7 5 1 uF 50 V electrolytic cap or tant (preferably non-polarized) C4,11,12 3 .01 uF/50 V disc cap C8,10 2 100 uF @ 25 V electrolytic cap C9 1 5 uF @ 150 V electrolytic cap C13 1 10 uF @ 25 V electrolytic cap TM1 1 555 timer dip A1 1 CA3018 amp array in can Q1,2 2 PN2222 npn sil transistor Q3 1 D4OD5 npn pwr tab transistor D1,2 2 50 V 1 amp react. 1N4002 T1 1 1.5 k/500 matching transformer M1 1 large crystal microphone J1 1 Phono jack optional for sense output WR3 (24") #24 red and black hook up wire WR4 (24") #24 black hook up wire CL3,4 2 Alligator clips CL1,2 2 6" battery snap clips PB1 1 1 3/4x4 1/2x.1 perfboard CA1 1 5 1/4x3x2 1/8 grey enclosure fab WR15 (12") #24 buss wire KN1 1 small plastic knob BU1 1 small clamp bushing B1,2 2 9 volt transistor battery or 9V ni-cad Circuit Operation: Not being the most technical guy in the world, and not being very good at electronics (yet), I'm just repeating what Mr. Iannini's said about the circuit operation. The Transmitter consists of a high grain amplifier fed into the telephone lines via transformer. The circuit is initiated by the action of a voltage transient pulse occurring across the phone line at the instant the telephone circuit is made (the ring, in other words). This transient immediately triggers a timer whose output pin 3 goes positive, turning on transistors Q2 and Q3. Timer TM1 now remains in this state for a period depending on the values of R17 and C13 (usually about 10 seconds for the values shown). When Q3 is turned on by the timer, a simulated "off hook" condition is created by the switching action of Q3 connecting the 500 ohm winding of the transformer directly across the phone lines. Simultaneously, Q2 clamps the ground of A1, amplifier, and Q1, output transistor, to the negative return of B1,B2, therefore enabling this amplifier section. Note that B2 is always required by supplying quiescent power to TM1 during normal conditions. System is off/on controlled by S1 (switch). A crystal mike picks up the sounds that are fed to the first two transistors of the A1 array connected as an emitter follower driving the remaining two transistors as cascaded common emitters. Output of the array now drives Q1 capacitively coupled to the 1500 ohm winding of T1. R7 controls the pick up sensitivity of the system. Diode D1 is forward biased at the instant of connection and essentially applies a negative pulse at pin 2 of TM1, initiating the cycle. D2 clamps any high positive pulses. C9 dc-isolates and desensitizes the circuit. The system described should operate when any incoming call is made without ringing the phone. Schematic Diagram: Because this is text, this doesn't look too hot. Please use a little imagination! I will hopefully get a graphics drawing of this out as soon as I can on a Fontrix graffile. To be able to see what everything is, this character: | should appear as a horizontal bar. I did this on a ][e using a ][e 80 column card, so I'm sorry if it looks kinda weird to you. Symbols: resistor: -/\/\/- switch: _/ _ battery: -|!|!- capacitor (electrolytic): -|(- capacitor (disc): -||- _ _ transistor:(c) > (e) Transformer: )||( \_/ )||( |(b) _)||(_ diode: |< chip: ._____. !_____! (chips are easy to recognize!) Dots imply a connection between wires. NO DOT, NO CONNECTION. ie.: _!_ means a connection while _|_ means no connection. ---------------------------------------------------------------------------- .________________________to GREEN wire phone line | | .______________________to RED wire phone line | | | | ._________(M1)______________. | | | | | | | R1 | | | !__________/\/\/____________! | | | _!_ C1 | | |this wire is the amp ___ | | |<=ground | R2 | | | !___________________/\/\/_____________. | | | ._______!_______. | | | !___________________!4 9 11!_____________________________! | | | | | | | | !___________________!7 12._____________________________! | | | | A1 | R3 | | | !___________________!10 ____*8!_______.____/\/\/____________! ^ | | | | / | | | | | | | C4 | / | \ |2ma | | !____||______. | / | /R4 B1 + | | | || | | / | \ |!|! | | | R7 | C2 | / | / | | | !____/\/\/___!__)|__!8*_/ | | S1 | | | | ^ | 6!_______! neg<__/.__! | | | | C3 | | | C5 return | | | | !_____|(___.__!3 | '-|(-| | | | | | | 5 1!____________! | | | | \ !_______._______! | B2|!|! | | !________. R8 / | | + | | | \ | | R6 |3ma | | | !__________!____________________|_____/\/\/______! | | | | R5 | | | v | | !__/\/\/___________|____________________! | | | | | | | | | | | | | | C6 | | | | | |-)|-' R9 | | | | !_________________/\/\/_______. | | | | | | | | | | Q1 _!_ | R10 | | | !____________/ \____________________________!__/\/\/_____! | | | | | | | | | | | | | C8 | | | | !__________)|_______________________________|____________! | | ! | | | | / | | | | -----| | | | | | \ | | | | | > | | | | | | | | | | | | | | | | | !_____________. | | | | | | | | | | !__________. | | | | | | | | | | !________. | | ._____! ...
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